The first-ever national test of the “presidential alert” system for mobile phones and similar devices was originally planned for Sept. 20, but it was delayed due to the onslaught from Hurricane Florence.

Wireless phone users have the ability to opt out of most alerts sent under the Integrated Public Alert and Warning System, run by the Federal Emergency Management Agency. While some users can choose not to receive regional messages and so-called Amber Alerts regarding missing or endangered children, under federal rules, receipt of the top-level “presidential alerts“ is mandatory.

In the new lawsuit, J.B. Nicholas, Kristine Rakowsky and Liane Nikitovich contend that the system will effectively turn them into “government loudspeakers” that would allow Trump or others to disseminate propaganda.